This is the single Melchizedek node in Adams, and it is a strong one: a sect that made Melchizedek not a man but a heavenly power ranked above Christ himself.
In Hannah Adams
In Adams’s own words, from the 1817 Dictionary. Each passage is quoted verbatim under its own entry.
Melchizedeckians, a denomination which arose about the beginning of the third century. They affirmed that Melchizedec was not a man, but a heavenly power, superiour to Jesus Christ.
Hannah Adams, A Dictionary of All Religions (Boston, 1817), entry “Melchizedeckians.”